@INPROCEEDINGS{Selikov+95,
  author       = {�������, A. Z. and ��������, L. A. and ����������, L. S. and ������, �. �.},
  title        = {On the approach to optimal control
                  of queuing systems with multiple classes of customers},
  booktitle    = {Proc.\ International Conf.\ on Syst.\ Sci.\ XII.},
  address      = {Wroclaw (Poland)},
  year         = {1995},
  pages        = {507-515},
  language     = {russian},
}
